Next Article in Journal
Reversible pH-Sensitive Chitosan-Based Hydrogels. Influence of Dispersion Composition on Rheological Properties and Sustained Drug Delivery
Next Article in Special Issue
Processing and Thermal Response of Temperature-Sensitive-Gel(TSG)/Polymer Composites
Previous Article in Journal
Application of Chitin/Chitosan and Their Derivatives in the Papermaking Industry
Previous Article in Special Issue
Hydrophobicity Tuning by the Fast Evolution of Mold Temperature during Injection Molding
Article Menu
Issue 4 (April) cover image

Export Article

Open AccessArticle
Polymers 2018, 10(4), 391; https://doi.org/10.3390/polym10040391

Single-Point Incremental Forming of Two Biocompatible Polymers: An Insight into Their Thermal and Structural Properties

1
Tecnologico de Monterrey, Escuela de Ingeniería y Ciencias, Ave. Eugenio Garza Sada 2501, Monterrey 64849, México
2
Mechanical Engineering and Industrial Construction Department, Campus Montilivi, University of Girona, 17071 Girona, Spain
3
Centro de Investigación en Química Aplicada, Blvd. Ing. Enrique Reyna No. 140, Saltillo 25253, México
*
Author to whom correspondence should be addressed.
Received: 6 March 2018 / Revised: 20 March 2018 / Accepted: 28 March 2018 / Published: 1 April 2018
(This article belongs to the Special Issue Processing-Structure-Properties Relationships in Polymers)
Full-Text   |   PDF [15543 KB, uploaded 3 May 2018]   |  

Abstract

Sheets of polycaprolactone (PCL) and ultra-high molecular weight polyethylene (UHMWPE) were fabricated and shaped by the Single-Point Incremental Forming process (SPIF). The performance of these biocompatible polymers in SPIF was assessed through the variation of four main parameters: the diameter of the forming tool, the spindle speed, the feed rate, and the step size based on a Box–Behnken design of experiments of four variables and three levels. The design of experiments allowed us to identify the parameters that most affect the forming of PCL and UHMWPE. The study was completed by means of a deep characterization of the thermal and structural properties of both polymers. These properties were correlated to the performance of the polymers observed in SPIF, and it was found that the polymer chains are oriented as a consequence of the SPIF processing. Moreover, by X-ray diffraction it was proved that polymer chains behave differently on each surface of the fabricated parts, since the chains on the surface in contact with the forming tool are oriented horizontally, while on the opposite surface they are oriented in the vertical direction. The unit cell of UHMWPE is distorted, passing from an orthorhombic cell to a monoclinic due to the slippage between crystallites. This slippage between crystallites was observed in both PCL and UHMWPE, and was identified as an alpha star thermal transition located in the rubbery region between the glass transition and the melting point of each polymer. View Full-Text
Keywords: polycaprolactone; ultra-high molecular weight polyethylene; incremental forming; SPIF; XRD; chain orientation polycaprolactone; ultra-high molecular weight polyethylene; incremental forming; SPIF; XRD; chain orientation
Figures

Graphical abstract

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
SciFeed

Share & Cite This Article

MDPI and ACS Style

Lozano-Sánchez, L.M.; Bagudanch, I.; Sustaita, A.O.; Iturbe-Ek, J.; Elizalde, L.E.; Garcia-Romeu, M.L.; Elías-Zúñiga, A. Single-Point Incremental Forming of Two Biocompatible Polymers: An Insight into Their Thermal and Structural Properties. Polymers 2018, 10, 391.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Polymers EISSN 2073-4360 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top